mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-06-02 16:48:43 +02:00
307 lines
8.6 KiB
C
307 lines
8.6 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
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* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: channel mapping 0 implementation
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********************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "ogg.h"
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#include "ivorbiscodec.h"
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#include "mdct.h"
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#include "codec_internal.h"
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#include "codebook.h"
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#include "window.h"
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#include "registry.h"
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#include "misc.h"
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/* simplistic, wasteful way of doing this (unique lookup for each
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mode/submapping); there should be a central repository for
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identical lookups. That will require minor work, so I'm putting it
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off as low priority.
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Why a lookup for each backend in a given mode? Because the
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blocksize is set by the mode, and low backend lookups may require
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parameters from other areas of the mode/mapping */
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typedef struct {
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vorbis_info_mode *mode;
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vorbis_info_mapping0 *map;
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vorbis_look_floor **floor_look;
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vorbis_look_residue **residue_look;
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vorbis_func_floor **floor_func;
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vorbis_func_residue **residue_func;
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int ch;
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long lastframe; /* if a different mode is called, we need to
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invalidate decay */
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} vorbis_look_mapping0;
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static void mapping0_free_info(vorbis_info_mapping *i){
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vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)i;
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if(info){
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memset(info,0,sizeof(*info));
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_ogg_free(info);
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}
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}
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static void mapping0_free_look(vorbis_look_mapping *look){
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int i;
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vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look;
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if(l){
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for(i=0;i<l->map->submaps;i++){
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l->floor_func[i]->free_look(l->floor_look[i]);
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l->residue_func[i]->free_look(l->residue_look[i]);
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}
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_ogg_free(l->floor_func);
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_ogg_free(l->residue_func);
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_ogg_free(l->floor_look);
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_ogg_free(l->residue_look);
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memset(l,0,sizeof(*l));
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_ogg_free(l);
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}
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}
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static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
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vorbis_info_mapping *m){
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int i;
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vorbis_info *vi=vd->vi;
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)_ogg_calloc(1,sizeof(*look));
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vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m;
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look->mode=vm;
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look->floor_look=(vorbis_look_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_look));
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look->residue_look=(vorbis_look_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_look));
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look->floor_func=(vorbis_func_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_func));
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look->residue_func=(vorbis_func_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_func));
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for(i=0;i<info->submaps;i++){
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int floornum=info->floorsubmap[i];
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int resnum=info->residuesubmap[i];
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look->floor_func[i]=_floor_P[ci->floor_type[floornum]];
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look->floor_look[i]=look->floor_func[i]->
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look(vd,vm,ci->floor_param[floornum]);
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look->residue_func[i]=_residue_P[ci->residue_type[resnum]];
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look->residue_look[i]=look->residue_func[i]->
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look(vd,vm,ci->residue_param[resnum]);
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}
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look->ch=vi->channels;
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return(look);
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}
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static int ilog(unsigned int v){
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int ret=0;
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if(v)--v;
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while(v){
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ret++;
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v>>=1;
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}
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return(ret);
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}
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/* also responsible for range checking */
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static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
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int i;
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vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)_ogg_calloc(1,sizeof(*info));
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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memset(info,0,sizeof(*info));
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if(oggpack_read(opb,1))
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info->submaps=oggpack_read(opb,4)+1;
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else
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info->submaps=1;
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if(oggpack_read(opb,1)){
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info->coupling_steps=oggpack_read(opb,8)+1;
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for(i=0;i<info->coupling_steps;i++){
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int testM=info->coupling_mag[i]=oggpack_read(opb,ilog(vi->channels));
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int testA=info->coupling_ang[i]=oggpack_read(opb,ilog(vi->channels));
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if(testM<0 ||
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testA<0 ||
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testM==testA ||
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testM>=vi->channels ||
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testA>=vi->channels) goto err_out;
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}
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}
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if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */
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if(info->submaps>1){
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for(i=0;i<vi->channels;i++){
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info->chmuxlist[i]=oggpack_read(opb,4);
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if(info->chmuxlist[i]>=info->submaps)goto err_out;
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}
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}
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for(i=0;i<info->submaps;i++){
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int temp=oggpack_read(opb,8);
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if(temp>=ci->times)goto err_out;
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info->floorsubmap[i]=oggpack_read(opb,8);
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if(info->floorsubmap[i]>=ci->floors)goto err_out;
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info->residuesubmap[i]=oggpack_read(opb,8);
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if(info->residuesubmap[i]>=ci->residues)goto err_out;
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}
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return info;
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err_out:
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mapping0_free_info(info);
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return(NULL);
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}
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static int seq=0;
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static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
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vorbis_dsp_state *vd=vb->vd;
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vorbis_info *vi=vd->vi;
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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private_state *b=(private_state *)vd->backend_state;
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vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l;
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vorbis_info_mapping0 *info=look->map;
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int i,j;
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long n=vb->pcmend=ci->blocksizes[vb->W];
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ogg_int32_t **pcmbundle=(ogg_int32_t **)alloca(sizeof(*pcmbundle)*vi->channels);
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int *zerobundle=(int *)alloca(sizeof(*zerobundle)*vi->channels);
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int *nonzero =(int *)alloca(sizeof(*nonzero)*vi->channels);
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void **floormemo=(void **)alloca(sizeof(*floormemo)*vi->channels);
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/* time domain information decode (note that applying the
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information would have to happen later; we'll probably add a
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function entry to the harness for that later */
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/* NOT IMPLEMENTED */
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/* recover the spectral envelope; store it in the PCM vector for now */
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for(i=0;i<vi->channels;i++){
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int submap=info->chmuxlist[i];
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floormemo[i]=look->floor_func[submap]->
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inverse1(vb,look->floor_look[submap]);
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if(floormemo[i])
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nonzero[i]=1;
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else
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nonzero[i]=0;
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memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2);
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}
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/* channel coupling can 'dirty' the nonzero listing */
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for(i=0;i<info->coupling_steps;i++){
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if(nonzero[info->coupling_mag[i]] ||
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nonzero[info->coupling_ang[i]]){
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nonzero[info->coupling_mag[i]]=1;
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nonzero[info->coupling_ang[i]]=1;
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}
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}
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/* recover the residue into our working vectors */
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for(i=0;i<info->submaps;i++){
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int ch_in_bundle=0;
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for(j=0;j<vi->channels;j++){
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if(info->chmuxlist[j]==i){
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if(nonzero[j])
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zerobundle[ch_in_bundle]=1;
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else
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zerobundle[ch_in_bundle]=0;
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pcmbundle[ch_in_bundle++]=vb->pcm[j];
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}
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}
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look->residue_func[i]->inverse(vb,look->residue_look[i],
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pcmbundle,zerobundle,ch_in_bundle);
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}
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/* channel coupling */
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for(i=info->coupling_steps-1;i>=0;i--){
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ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]];
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ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]];
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for(j=0;j<n/2;j++){
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ogg_int32_t mag=pcmM[j];
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ogg_int32_t ang=pcmA[j];
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if(mag>0)
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if(ang>0){
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pcmM[j]=mag;
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pcmA[j]=mag-ang;
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}else{
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pcmA[j]=mag;
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pcmM[j]=mag+ang;
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}
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else
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if(ang>0){
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pcmM[j]=mag;
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pcmA[j]=mag+ang;
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}else{
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pcmA[j]=mag;
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pcmM[j]=mag-ang;
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}
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}
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}
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/* compute and apply spectral envelope */
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for(i=0;i<vi->channels;i++){
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ogg_int32_t *pcm=vb->pcm[i];
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int submap=info->chmuxlist[i];
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look->floor_func[submap]->
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inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
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}
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/* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
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/* only MDCT right now.... */
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for(i=0;i<vi->channels;i++){
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ogg_int32_t *pcm=vb->pcm[i];
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mdct_backward(n,pcm,pcm);
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}
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/* window the data */
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for(i=0;i<vi->channels;i++){
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ogg_int32_t *pcm=vb->pcm[i];
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if(nonzero[i])
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_vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
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else
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for(j=0;j<n;j++)
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pcm[j]=0;
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}
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seq+=vi->channels;
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/* all done! */
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return(0);
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}
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/* export hooks */
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vorbis_func_mapping mapping0_exportbundle={
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&mapping0_unpack,
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&mapping0_look,
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&mapping0_free_info,
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&mapping0_free_look,
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&mapping0_inverse
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};
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